=== Watershed ===
 http://www.prip.tuwien.ac.at/~hanbury/intro_ip/
 http://www.reindeergraphics.com/tutorial/chap6/binary04.html
 http://www.google.co.kr/url?sa=U&start=6&q=http://www.isprs.org/istanbul2004/comm4/papers/509.pdf&e=747
 http://www.google.co.kr/url?sa=U&start=8&q=http://www.vision.caltech.edu/pmoreels/Publications/PmoreelsIEEE_IP_Jul03.pdf&e=747
 http://www.google.co.kr/url?sa=U&start=11&q=http://www.cv.tu-berlin.de/~vr/papers/acrobat/TGJGD97.pdf&e=747

=== Hough Transform ===
 http://www.anc.ed.ac.uk/~amos/hough.html
 http://rkb.home.cern.ch/rkb/AN16pp/node122.html
 http://www.netnam.vn/unescocourse/computervision/62.htm
 http://planetmath.org/encyclopedia/HoughTransform.html
 http://visl.technion.ac.il/labs/anat/12-Hough/

=== Opening / Closing ===
 http://www.reindeergraphics.com/tutorial/chap6/binary02.html
 http://greta.cs.ioc.ee/~khoros2/non-linear/dil-ero-open-close/front-page.html
 http://www.ph.tn.tudelft.nl/Courses/FIP/noframes/fip-Morpholo.html#Heading98
 
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